model:

class Profile(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE, verbose_name='暱稱')
    nickname = models.CharField(max_length=20)

    def __str__(self):
        return '<Profile: %s for %s>' % (self.nickname, self.user.username)

admin.py

from django.contrib import admin
from django.contrib.auth.models import User
from .models import Profile


class ProfileInline(admin.StackedInline): #將Profile加入到Admin的user表中,內聯
    model = Profile
    can_delete = False

class UserAdmin(admin.ModelAdmin):
    inlines = [ProfileInline]
    list_display = ('username', 'nickname', 'email', 'is_staff', 'is_active', 'is_superuser')

    def nickname(self, obj):
        return obj.profile.nickname #自定義欄位顯示資訊

    nickname.short_description = '暱稱'

# Re-register UserAdmin
admin.site.unregister(User) #去掉在admin中的註冊
admin.site.register(User, UserAdmin) #用UserAdmin註冊user